Looking for a good developer who's familiar with AMAZON API

General information for the website: we provide free service for amazon sellers to be able to protect their business.
Kind of development: Customization of existing website
Description of requirements/features: i have a website that fetch data directly from Amazon using Amazon API.

but for some reason when we put the ASIN Number, the website doesn't fetch the right number of sellers that sell their product under that ASIN and therefor it doesnt trigger the automated emails that are already set.

for example: this ASIN Number "B010Q57T02" has around 23 sellers, but when i put the ASIN number in my website it only show 1 seller instead of 23 sellers. (see attached image).

am looking for someone who is familiar with Amazon API that can fix this problem so the website will be able to fetch the number of sellers under the given ASIN.
Extra notes: please dont apply for this job if you think you are not going to deliver. or you just going to waste my time.